Video clip length playing shorter on my mac

Hi all,
Fairly new to mac, so apologies if this is fairly basic.
I have some video files stored on an external hard drive. If I open a file using my PC the video file plays the full length of the clip, yet if I open the file using my mac it opens no problem, yet only plays part of the clip. Can anyone explain why this might be happening ??
Many thanks in advance

Timecode "breaks" in your AVI files.
Use MPEG Streamclip (free) to "repair" them.

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